Siwutang and Siwuyin are both traditional Chinese medicine secrets, which are used to regulate women's irregular menstruation or menorrhagia. Their ingredients mainly include Angelica sinensis, Radix Rehmanniae Preparata, Radix Paeoniae Alba and Rhizoma Chuanxiong. Siwutang is a decoction made by boiling four kinds of traditional Chinese medicines. It tastes bitter and needs to be boiled for a long time, but the effect is very good. Siwuyin is to add four kinds of traditional Chinese medicines into tea and stir it. It tastes softer and easier to drink. In the treatment of irregular menstruation, Siwutang and Siwuyin have similar functions, but different drinking methods and doses are selected according to individual needs. In addition, if you have other diseases, you need to choose them carefully according to the specific situation. It is recommended to use it under the guidance of Chinese medicine practitioners.